--- title: "Case Study: River & Flood Protection Project in West Bengal Using Ocean HDPE Liner – 750 Micron" date: 2025-06-21 author: "Sales Team" url: https://oceangeosynthetics.com/west-bengal-flood-protection-hdpe-liner-case-study/ --- June 21, 2025 | [Case Studies](https://oceangeosynthetics.com/category/case-studies/) # Case Study: River & Flood Protection Project in West Bengal Using Ocean HDPE Liner – 750 Micron West Bengal’s dense river network and heavy monsoon rainfall make it one of India’s most flood-prone states. For a riverbank stabilization and [flood protection](https://en.wikipedia.org/wiki/Flood_management) project in a high-risk river zone in rural **West Bengal**, **Ocean Non Wovens** supplied and installed **7,800 SQM of Ocean [HDPE Liner](https://oceangeosynthetics.com/products/ocean-geomembrane/high-density-polyethylene-sheets-hdpe/), 750 Micron**, chosen to resist hydraulic pressure and soil erosion. ## Implementation highlights **Location:** A flood-vulnerable river zone in rural West Bengal **Total Area Covered:** 7,800 SQM **Product Supplied & Installed:** Ocean HDPE Liner, 750 Micron **Installation Partner:** Ocean Non Wovens technical field team **Project Duration:** 21 working days ## The problem on site Sandbags, stone pitching and concrete blocks are the usual flood defences, but they are labour-intensive, and loose or rigid units are displaced or undermined by scour. On this stretch the project team faced: - Continuous erosion during monsoon surges - Riverbed scouring and land degradation - Seepage weakening the embankment foundations - Risk to nearby infrastructure and farmland The embankment needed a flexible, impermeable layer that could follow the bank profile and cut off seepage through it. ## Why Ocean HDPE Liner, 750 Micron Ocean HDPE Liner, 750 Micron is a 0.75 mm high-density polyethylene [geomembrane](https://oceangeosynthetics.com/products/ocean-geomembrane/) used for riverbank lining, flood barriers and hydraulic containment. - **Tensile strength:** withstands water flow and mechanical stress during placement and service. - **Chemical resistance:** unaffected by saline, acidic or polluted river water. - **UV resistance:** carbon-black stabilised for exposed riverbank conditions. - **Low permeability:** blocks seepage through the embankment, which removes the water pressure that drives internal erosion (piping). ## How it was installed 1. **Site preparation:** surface levelling, debris removal and compaction. 2. **Base layer:** a protective [geotextile](https://oceangeosynthetics.com/products/geotextile-manufacturers/) was laid under the HDPE liner to prevent punctures from sharp aggregate. 3. **Liner deployment:** rolls were laid out with machinery and the seams heat-welded by extrusion welding. 4. **Anchor trenches:** liner edges were anchored in trapezoidal trenches to resist uplift and movement during floods. 5. **Inspection and testing:** vacuum-box testing, spark testing and visual inspection checked 100% of the seams. Vacuum-box testing (ASTM D5641) draws a vacuum over a soaped seam and looks for bubbles; spark testing detects holes in extrusion welds made over an embedded conductive wire. Both are standard for extrusion seams, which have no air channel for pressure testing. ## Results and long-term benefits - **Reduced erosion:** soil loss and bank recession dropped after installation. - **Controlled seepage:** lower seepage through the embankment reduces the risk of embankment failure. - **Land retention:** farmland and infrastructure within the flood zone are protected. - **Lower maintenance:** fewer repeat repairs than loose or rigid defences. ## Details that affect long-term performance - **Cushion and slope design:** a geotextile under the liner and a controlled slope reduce puncture and sliding risk. - **Welded seams:** fused seams, tested along their full length, are as watertight as the sheet; simple overlaps without welding are not. - **Edge treatment:** where possible, Ocean’s team uses bio-engineered turf reinforcement at the edges to combine civil and vegetative flood defences. Ocean Non Wovens manufactures and supplies [geosynthetics](https://oceangeosynthetics.com/category/geosynthetics/) including HDPE liners, geotextiles, [geocells](https://oceangeosynthetics.com/products/geocells/) and drainage composites for flood and river protection, with technical support, quality assurance and installation guidance for government agencies, contractors and private developers. Read more on [flood control projects](https://oceangeosynthetics.com/flood-risk-management-with-geotextile-and-geotube-technology/) with geotextiles and geotubes, or contact Ocean Non Wovens to discuss your project. Get Ocean Geosynthetics in your Google feed[![](https://oceangeosynthetics.com/wp-content/uploads/2026/07/google-g-logo.svg)Add us as a preferred source on Google](https://www.google.com/preferences/source?q=https://oceangeosynthetics.com/) [![Case Study: Enhancing Durability and Efficiency in a Food Plant Project with Ocean Non Woven Geotextile](https://oceangeosynthetics.com/wp-content/uploads/2025/02/Capture-300x203.jpg)](https://oceangeosynthetics.com/food-plant-with-ocean-non-woven-geotextile/) [Case Studies](https://oceangeosynthetics.com/category/case-studies/) [Case Study: Enhancing Durability and Efficiency in a Food Plant Project with Ocean Non Woven Geotextile](https://oceangeosynthetics.com/food-plant-with-ocean-non-woven-geotextile/) Project overview A food plant in Uluberia, Howrah, needed stable ground under its floors and equipment, good drainage, and protection against soil movement in a… [See More](https://oceangeosynthetics.com/food-plant-with-ocean-non-woven-geotextile/) [![](https://oceangeosynthetics.com/wp-content/uploads/2022/11/Manas-geo-textile-300x169.jpeg)](https://oceangeosynthetics.com/geosynthetics-in-road-construction/) [Geosynthetics](https://oceangeosynthetics.com/category/geosynthetics/), [Insights](https://oceangeosynthetics.com/category/insights/) [Geosynthetics in Road Construction](https://oceangeosynthetics.com/geosynthetics-in-road-construction/) Geosynthetics are polymer products placed in or on soil to make a structure perform better. The name says it: "geo" for the earth and soil,… [See More](https://oceangeosynthetics.com/geosynthetics-in-road-construction/) [![Role of Geobags in Safeguarding Communities](https://oceangeosynthetics.com/wp-content/uploads/2025/09/Role-of-Geobags-in-Safeguarding-Communities-300x200.webp)](https://oceangeosynthetics.com/effective-flood-protection-with-durable-geobags/) [Case Studies](https://oceangeosynthetics.com/category/case-studies/), [Geobags](https://oceangeosynthetics.com/category/geobags/), [Insights](https://oceangeosynthetics.com/category/insights/) [Flood Protection Solutions: The Role of Geobags in Safeguarding Communities](https://oceangeosynthetics.com/effective-flood-protection-with-durable-geobags/) For a recent flood protection project, Ocean Non Wovens supplied and deployed 5,000 SQM of geobags made from UV-resistant polypropylene fabric. 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